How should we protect ourselves from polluted weather?

Close the doors and windows in foggy days to prevent outdoor fog from entering the room and polluting the indoor air. When it is really necessary to open the window for ventilation, you can choose to open the window for a short time at noon with more sunshine and less pollutants. When ventilating, you can open a crack in the window, and you can't let the wind blow in directly. Ventilation for half an hour at a time is appropriate. In foggy days, indoor smoking and cooking with high oil fume should be reduced, and families with conditions can also use air purifiers or fresh air filtration systems to control indoor particulate pollution. Raising some green plants also has a good effect on reducing indoor dust. The elderly and children with weak resistance and people susceptible to respiratory diseases should try to reduce going out or outdoor activities. If you need to go out, you can wear a mask to protect your body and prevent pollutants from invading your lungs through your nose and mouth. When you come back from going out, you should wash your face, hands, nostrils and bare skin immediately. Objective Gauze masks can filter out most of the dust and germs, but they have little protective effect on PM2.5 Activated carbon masks are added with a layer of activated carbon with adsorption function, but they only play a role in isolating odor and preventing particulate smog. Medical masks include medical disposable masks and N95 masks. Ordinary disposable medical masks are generally made of non-woven fabrics, which have anti-foam and moisture absorption functions, but the effect of filtering particulate matter is not ideal, and it is not suitable for resisting PM2.5 Relatively speaking, N95 masks have better anti-smog effect, but their air permeability is poor, which easily leads to breathing difficulties. Long-term wearing will lead to hypoxia and chest tightness, and it is not suitable for children, the elderly and patients with cardiovascular diseases with poor respiratory function to wear for a long time.